Boiler.



PATENTED JA 'ff- J, RBNSHAW. N lo 1907 BOILER.

APrLIoATIoN FILED MAY22,1906.

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No. 841,571. PATENTBD JAN. 15, 1907.

J. RENSHAW.

BOILER.

APPLICATION FILED MAY 22,1906.

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PATENTED JAN. l5, 190'7. AJ. RENSHAW.

BOILBR. APPLIGATION'FILED MAY 22, 1906.

1HE Nor-ms Pars rs UNITED STATES arnNfr ortica BOILER.

Specification' of Letters Patent.

Patented Jan. 15, 1907.

Application filed May 22,1906. Serial N 318,177-

Be it known that I, JAMES RENsHAw, a citizen of the United States of America, residing at Point Marion, in the county of Fayette and State of Pennsylvania, have invented certain new and useful Improvements in Boilers and Furnaces, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in tubular jacket-boil ers of that type designed for furnaces and engines.

The invention aims to provide a novel form of boiler wherein a water-jacket is employed to increase the efficiency of aboiler. In this connection the water-jacket is adapted to confine the heat units of the fuel and increase the heating capacity thereof.

In constructing my improved boiler, which is practically a boiler' within a boiler, I aim to prevent a sudden and unwarranted cooling of a boiler by the injection of water therein, the troublesome defect commonly known as "spark-throwing, also the waste of heat, which amounts to approxin'iatelyT sixty-five per cent. in boilers heretofore used. In the iirst instance the injection of cold water into a boiler tends to cool the same and reduce the elliciency of a boiler. In the second instance the spark-throwing is caused by the products of combustion passing directly through a boiler to the exhaust stack or flue, this sparkthrowing also causing' a great waste of heat units,\\hich pass directly through a boiler on account of both ends of an ordinary boiler be.-

ing open. In overcoming the above defects I have devised a boiler wherein the distribution of heat is more equalized and so constructed that when water is injected into the boiler it will go to the bottom and occupy a small heated space. I obviate spark-throwing by locating the lire-grates in close proximity to the top of the bridge-wall of my improved boiler and by closing the ends thereof, thus conning the products of combustion within t-he tubular compartment of a boiler, where they are consumed before passing to the exhaust-flue. In this manner I also confine the heat which ordinarily radiates from a boiler, the heat that may radiate being absorbed by my improved waterjacket, which surrounds the combustionchamber and the tubular compartment of my improved boiler.

lith the above and other objects in view,

which will more readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination, and arrangement of parts, to be hereinafter more fully described and then speciiically pointed out in the claims, and referring to the drawings'forming a part of the specification like numerals of reference designate corresponding parts throughout the several views, in which- Figure 1 is a longitudinal sectional view of a boiler constructed in accordance with my invention. Fig. 2 is a cross-sectional view taken on the line x 0c of Fig. l. Fig. 3 is a similar view taken on the line w w of Fig. l. Fig. 4 is a similar view taken on the line 'y y of Fig. l looking in the direction of the arrow of said figure. Fig. 5 is a side elevationof the tubular portion of my improved boiler, illustrating the tubes, heads, and bridgewall of the boiler. Fig. 6 is a plan of the innermost shell or boiler. Fig. '7 is an enlarged detail sectional view of the rear end of my improved. boiler.

To put my invention into practice, I construct my improved boiler of a cylindrical casing l, which in appearance conforms substantially to the ordinary type of boiler, insomuch as the outer casing of the boiler at its rear end is provided with a depending ashpan 2, asteam-dome 3, and at its forward end with an exhaust stack or chimney 4'.

My invention resides particularly in an inner cylindrical shell or boiler 5, which is mounted within the rear end of the casing l and firmly secured by stay-bolts 5EL to the outer casing 1. This bracing of the shell to the casing materially strengthens the whole structure and renders it capable of withstanding heavy jars and strains. The rear bottom side of the inner shell;or boile'r 5 is cut away, as at 6, and provided with transverse grate-supporting beams 7 7, these beams supporting a plurality of longitudinally-disposed grate-bars 8. The edges of the inner shell or boiler 5 surrounding the cut-away portion are flanged, as at 9 9 and I() 10,in order that the rear end of the inner shell or boiler 5 may be bolted or otherwise secured to the casing l. The inner shell or boiler 5 is also cut away to form an opening ll, whereby easy access may be had for the hollow bridge-wall, which is mounted within the inner shell or boiler 5, and which will be presently described.

The rear end of the inner shell of casing 5 is IOO IIO

being riveted to the end of the with a fire-box head 12, said head boiler 5. The head is provided with a flanged opening 14, the flanges 15 of said opening being riveted, as at 16, to a casing-head 17, similarly secured, as at 18, to the casing 1.

In the inner shell or boiler 5 is mounted a tubular-headed structure 19, said structure consisting of a hollow bridge-wall 20, a` tubehead 21, and a water-jacket head 22. The hollow bridge-wall 20 is flanged, as at 23, and secured to the edges of the opening 11 directly in front of the grate-bars 8, said bridge-wall extending into close proximity to the top of the inner shell or boiler 5. The tube-head 21 is riveted, as at 24, in the forward end of the inner shell or boiler 5, and between said head and the forward side of the bridge-Wall 2O is arranged aplurality of longitudinally-disposed tubes 25. The water-jacket head 22 is riveted, as at 25, to the casing 1, and between said head and the tube-head 21 is mounted a plurality of circumferentially-arranged draft-tubes 26, said tubes establishing communication between the boiler 5 and the forward end or smokeboX 27 of the casing 1.

In order that the tubes 25 can be conveniently arranged between the bridge-wall 20 and the tube-head 21, I provide the waterjacket head 22 and the rear side of the bridgewall 2() with a plurality of openings 28 and 29, respectively, said openings being of a larger diameter than the tube-openings in the head 21 and the bridge-wall, but alining with said openings, whereby the tubes 25- can be passed through the head 22 and the rear side of the bridge-wall 20. The openings 2S and 29 are afterward provided with plugs 30 to assist in forming a perfect water-jacket around the inner shell or boiler 5.

The forward end of the casing 1 is provided with a head 31, which is riveted, as at 32, to the casing, and in order that easy access may be had to the interior of the casing 1 adjacent to the bridge-wall 20 and to the interior of the boiler 5 beneath the tubes or flues 25 I provide the casing 1 with a conventional form of hand-hole 33, the closure of which has water-tight connection with the boiler 5 and the casing 1.

The rear end of the boiler 5, forming the combustion-chamber 35 above the grate-bars 8, is lined with fire brick or tile 36, the llire brick or tile 37 protecting the bridge-wall from exposure ,to the flames of a fire maintained upon the grate-bars S.

The boiler is provided with a suitable water-inlet, (not shown,) whereby water 38 may be admitted to the casing 1, the water surrounding the boiler 5 and lying within the hollow bridge-wall 20, whereby the Water may circulate through the tubes or flues 25 and become thoroughly heated therein.

By the novel construction of my improved provided boiler it is evident that the inner shell or boiler 5 will confine the heat units of the combustion-chamber 35 and thoroughly utilize the same before they pass through the draft tubes or fines 26 into the smoke-box 27 and the stack 1. The heat that may radiate from the boiler 5 is absorbed or consumed by the water S8, which surrounds the inner shell or boiler 5, and the heating of the water within the jacket so formed tends to increase the efficiency of the boiler with a minimum expenditure 'of fuel. ln confining the products of combustion within the forward end of the boiler prior to their escape through the tubes or flues 26 the flames passing over the bridgewall 2O will tend to consume and ignite all gases that may be generated and collected within the forward end of the boiler 5, thus preventing spark-throwing and a waste of the fuel and products of combustion. lt will also be seen that I have devised a boiler having a light fire-bed within the combustionchamber 35, and therefore have decreased the draft or exhaust 'iues or tubes of an ordinary boiler, thus permitting a fireman maintaining an intense 'lire within the combustionchai'nber 35 and keeping the grate-bars in a perfect condition to assist in the draft of the boiler, and the perfect combustion of the fuel used.

I preferably suspend a number of rows of rods 39 within the shell 5, by means of brackets 40, bolted at their ends to the shell. rllwo .rows of these rods are shown in Fig. 1, and they serve as heat-absorbers, thus increasing the efficiency of the boiler.

My invention particularly resides in the tubular-headed structure of the boiler or inner shell, which permits of a water-jacket being formed around the inner shell, and l desire it to be understood that such changes in the details of construction as are permissible by the appended claims may be resorted to without departing from the spirit and scope of the invention.

hat I claim, and desire to secure byLetters Patent, is

1. ln a boiler, the combination with a casing having asteam-dome, an ash-pan, an eX- hausi'i-stack, and heads, of an inner cylindrical shell mounted within said casing, and forming a water-jacket, said shell having a lined combustion-ch amber formed at its rear end, a tubular-headed structure mountedv in said shell and consisting of a bridge-wall, a tube-head. and a water-jacket head, tubes arranged between said bridge-wall and said tube-head, draft-lines circumferentially arranged between said tube-head and said water-jacket head, and means to permit of easy access being had to the interior of said casing and said shell, substantially as described.

2. ln a boiler, the combination with a casing, of a cylindricalv shell mounted within said I IO casing and forming a Water-jacket, said shell having a combustion-chamber formed in its rear end, a headed tubular structure mounted in the opposite end of said shell, said structure consisting ot a bridge-Wall,tubes, and a head adapted to close said shell, draft-nues carried by said head, and establishing communication between the interior of said shell and the front end of said casing, substantially as described.

3. A boiler ofthe type described consisting of a casing, an inner cylindrical shell mounted in said casing and forming a water-jacket within said casing, said shell having a combustion-chamber `formed therein, a headed tubular structure, mount-ed in said shell, said structure consisting of a bridge-wall, heads, tubes arranged between said heads, and means t-o permit of easy access being had to the interior of said casing and said shell, subst antiially as described.

4. A boiler consisting of a casing, a shell mounted within said casing and forming a water-jacket, said shell having a combustionchaniber formed therein7 and a headed tubular structure mounted in said shell, said structure consisting of a bridge-wall, heads and tubes, substantially as described.

5. A boiler consisting of a casing, a shell within said casing forming a water-jacket, and having a combustion-chamber formed therein, a headed tubular structure consisting of a bridge-wall, heads, and tubes, and means for supporting said headed tubular structure.

6. A tubular boiler comprising an outer cas ing, and an inner shell supported Within the casing to provide a water-jacket, in combination with a hollow bridge-wall forming a Water-space in rear of the boiler-tubes, a head dividing the Water-chamber from the smokeboX, and pipe connections between the combustion-chamber and smoke-box supported by said head, and by the head ot the inner shell.

In Atestimony whereof I affix my signature in the presence of two witnesses.

J AMES RENSHAVV.

Witnesses:

JOE COLEMAN, ALBERT ZIERER. 

